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Purification method for low-melting-point metal

A low-melting-point metal, purification method technology, applied in chemical instruments and methods, crystal growth, self-solid and other directions, can solve the problems of small output, low purity, high energy consumption, etc., and achieve the effect of less process and simple operation

Active Publication Date: 2018-10-02
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Among them, regional smelting is the process of making raw materials into sintered rods, using high-frequency coils or focused infrared rays to heat the part of the sintered rods, and separating the metal samples from the trace impurities contained in them through local melting of the metal samples. The purification has high purity, but the output is small; electrolytic refining uses the difference in the difficulty of anode dissolution or cathode precipitation of different elements to extract pure metals, which has high yield and is easy to produce in industry, but the purity is relatively low; vacuum distillation is the use of distillate Separation and purification based on the differences in certain physical properties of each component, with high purification purity, high output, and environmental protection, but the distillation furnace is a non-standard equipment that requires special design; solid-phase electromigration is a method of purifying metals using the principle of electromigration Advanced technology, high purification purity, but consumes a lot of energy and slow speed

Method used

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  • Purification method for low-melting-point metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for purifying low melting point metals, the specific steps are as follows:

[0025] (1) Weigh Ti according to the molar ratio of MAX phase mixed with purified metal Sn 1:0.01 2 SnC powder and 42Sn-58Bi alloy powder; stainless steel balls are used as grinding balls, and the mass ratio of grinding balls to raw materials is 30:1; the weighed raw material powders and grinding balls are added to the stainless steel ball milling tank; the sealed balls are milled The tank is loaded into a planetary ball mill, the ball milling speed is set to 500r / min, and the ball milling time is set to 20h.

[0026] (2) After ball milling, the powder is taken out, and cold-pressed into a thin sheet sample with a thickness of 1 mm.

[0027] (3) Place the thin slice sample in a heat treatment furnace, keep it warm at 230°C for 300min in a nitrogen atmosphere, and then cool it down to room temperature naturally (this step can be skipped, and proceed directly to the next step).

[0028...

Embodiment 2

[0031] (1) Weigh Ti according to the molar ratio of MAX phase mixed with purified metal In 1:0.005 2 InC powder and 66In-34Bi alloy powder; stainless steel balls are used as grinding balls, and the mass ratio of grinding balls to raw materials is 10:1; the weighed raw material powders and grinding balls are added to the stainless steel ball milling tank; the sealed balls are milled The tank is loaded into a planetary ball mill, the ball milling speed is set to 800r / min, and the ball milling time is set to 8h.

[0032] (2) After ball milling, the powder is taken out, and cold-pressed into a thin sheet sample with a thickness of 1 mm.

[0033] (3) Place the thin slice sample in a heat treatment furnace, keep it warm at 150°C for 300min in an argon atmosphere, and then cool it down to room temperature naturally (this step can be skipped, and proceed directly to the next step).

[0034] (4) Place the thin slice sample at room temperature. After 16 days (if step 3 is skipped, this...

Embodiment 3

[0037] (1) Weigh Cr according to the molar ratio of MAX phase mixed with purified metal Ga 1:0.1 2 GaC powder and 0.66Bi-99.34Ga alloy; stainless steel balls are used as grinding balls, and the mass ratio of grinding balls to raw materials is 3:1; the weighed raw material powder and grinding balls are added to a stainless steel ball milling tank; the sealed The ball milling jar is loaded into the planetary ball mill, the ball milling speed is set to 300r / min, and the ball milling time is set to 80h.

[0038] (2) After ball milling, the powder was taken out, and cold-pressed into a thin sheet sample with a thickness of 500 μm.

[0039] (3) Place the thin slice sample in a heat treatment furnace, keep it warm at 25°C for 300min in an argon atmosphere, and then cool it down to room temperature naturally (this step can be skipped, and proceed directly to the next step).

[0040] (4) Place the thin slice sample at room temperature. After 2 days (if step 3 is skipped, this time wil...

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Abstract

The invention discloses a purification method for a low-melting-point metal. The method comprises the following steps: (1) mixing MAX phase powder with an extracted pure alloy containing a component metal A in proportion and carrying out ball milling in a ball mill; (2) carrying out cold pressing on the ball-milled powder to sheets; (3) placing the sheets in a thermal treatment furnace for thermaltreatment for 1-300min at a TA temperature near the melting point of metal A and then cooling the sheet naturally; (4) placing the sheets for 1-30 days at room temperature, and growing metal A whiskers on the surface of a to-be-test sample; and (5) collecting metal A whiskers on the surface of the sample. The purification method disclosed by the invention has the advantages of being simple in process, low in cost, environment-friendly, high in purity of extracted metal and the like, and solves the problems that an existing metal purification technology is complicated in process and high in cost, pollutes the environment and the like.

Description

technical field [0001] The invention belongs to the field of metal purification, and in particular relates to a method for purifying low melting point metals. Background technique [0002] With the rapid development of the national economy, especially the rapid development of the electronic industry, the research and utilization of various alloy solders are also developing at the same time. However, due to the rapid development of consumer electronic products and frequent replacement, more and more electronic and electrical equipment are eliminated and discarded due to various reasons. Solder, as an essential part of circuit connection, is discarded along with the discarding of electronic and electrical equipment. In order to reduce the pollution of waste solder to the environment and to reuse and effectively utilize resources, the recycling of alloy solder after use has received more and more attention. [0003] At present, the purification processes of low-melting-point ...

Claims

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Application Information

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IPC IPC(8): C22B9/14C30B29/02C30B29/62C30B1/02C22B25/08C22B58/00
Inventor 张培根唐静雯孙正明张亚梅陈坚刘玉爽田无边
Owner SOUTHEAST UNIV